[F8] Dynamic MC overlap problem

Hi,

I am using attach movie to populate the screen with a bunch of mc's. That part is working. Each mc is represented by a small red dot and each also has a rollover function that displays a label. Many of my attached mc's are very close to each other and on the roll over they are all overlapping or showing under the other mc's. What I want is on the roll over it should bring the currently rolled over button to the top level. Currently I am using swapdepths for each button to set the depth very high(swapDepths(100000000)), but still some are not appearing on the top.

On the first page load all works fine but once you add a city the depth problems appear. Check the link to see what I mean.

http://www.joeshields.net/flashlab/cityviewmax/

Any help would be appreciated.